Will 365cc take me from a 34a to a DD?

The best way to determine which size is best for you is to try on sizers.  Generally speaking if you are an A and want to be a DD, 365 will probably not be enough.  You will most likely be a C, as you suspected.  I would re-evaluate the size with your surgeon before the procedure, to prevent the disappointment of being too small.

It is very difficult to determine the exact size and shape implant you will require to best match your ideal breast image without an examination by a board certified plastic surgeon. Not just any board certified plastic surgeon, but one with many years of frequently performing breast augmentation surgery including different approaches, techniques and implant choices. This is because several measurements not to mention your breast characteristics are needed to determine the optimal implant size to obtain your goals. Without knowing these dimensions it would be difficult to make this determination. For example, the existing base width of your breast will determine, in many cases, the maximal volume per implant profile that you can accommodate. To illustrate; a 100 cc difference may make a significant difference with a narrow base width breast, but much less of a difference if you have a wide chest wall and wide breast “foot print”. Therefore, just because your friend may have a great result with let’s say a 350 cc implant to make her go from a “A” cup to a “C” cup size does not mean that you will have the same result with the same size implant. . Further simply placing implants in a bra to determine the size best for you is not always accurate as the bra often distorts the size, is dependent on the pressure the bra places plus the implant is outside your breast and not under it among other variables. Computer software morphing programs that automatically determine the best implant size can be helpful in some but not all cases (e.g. doesn’t work well in my experience with existing implants, sagging or asymmetric breasts). Using “want to be” photos however are useful if simply provided to the surgeon as I will further explain in a bit.Additional critical decisions will also be made by your plastic surgeon such as: whether your implants will be above or below your pectoralis muscle. These choices are recommended to you based on the look you desire, the amount of sagging you may have, and other deciding factors. For more than 25 years, I have tried just about every method to best understand and achieve the patient’s optimal goal. The following is what I have found to be most accurate: To start with, I have found it most helpful for patients to bring in photos from my or other plastic surgeons’ websites to illustrate what they would like to look like. This gives me detailed standardized views and information both qualitative (shape, perkiness) and qualitative (size) and allows me to discuss with my patients how I can best achieve their objectives as well as realistic expectations. For example, though I always tell my patients that I cannot make them exactly the same as a photo because everyone has different anatomical constraints. However, these ”ideal” breast photos are brought to the operating room for reference during surgery so that I have the advantage of “seeing through my patient’s eyes” to best achieve their wishes. Even if the photo does not match their height or weight, I and most plastic surgeons are very good at translating the proportionality of the photo to your features.I personally order more than one set of implant sizes and use sterile implant “sizers” (temporary implants) placed in the created implant pocket during surgery to know in advance exactly which implant would work best for you in both a sitting and lying down position. This also allows me the opportunity to modify the pocket to meet some of the more subtle shape features desired. This enables me to use my full artistic potential to achieve your desired goals.

Cups sizes vary with the bra manufacturers.  I would not focus on the letters, but get your surgeon a photograph of what you would like to look like and allow him to choose the implants for you.

The best implant choice to obtain a DD cup size depends on your current breast size as well as chest dimensions and skin quality.  Just based on the information given without photos, I am inclined to suggest a larger breast implant size in the order of 400-450 high profile for you to obtain this results. 

Breast Implant Size is a combination of subjective and objective criteria.There is not a direct correlation between the cc's of a breast implant and the corresponding cup size, as cup size is an inexact measurement that varies considerably among companies and even within the same company. Online consultants will not be able to guide you as well as surgeons who perform in person consultation.The size of the implants are based on a combination of a patient's goals and objectives and her anatomy. In order to provide a natural looking augmentation, the surgeon needs to evaluate many factors including soft tissue coverage, skin laxity, chest wall width, breast imprint width, the shape of the breasts and relative level of constriction to ensure that the breast implants are appropriate for your body.Consult in person with 3 experienced and expert board certified plastic surgeons to understand your options.

Generally speaking, I consider two factors when selecting implants for my patients:1. Dimensional planning2. Gel Implant Sizing systemDimensional
planning – The measurements of your chest wall are taken. Also, the
breast dimensions including the height, width, and current dimensions of
each breast form the basis of dimensional planning. Based on these
measurements, the implant size is recommended. This will give you a
unique breast implant that is suited for your body frame. However, there
are some limitations of what size we can recommend. For instance, some
implants may just be too big for a narrow chest wall. Your surgeon can
review this with you during the consultation.Gel Implant Sizing
system – During the preliminary breast implant consultation, you will be
provided with an option to “try on” a variety of implant shapes and
sizes. You can also visualize the possible outcomes of your surgery
which helps you to get that perfect size to give you the shape that you
longed for. This way your preferences are known and you can then pick a
range of implants that will “fit” just right to give a soft natural
fuller look. Hope this helps.Dr. BasuHouston, TX

Thank you for the question.   You will find that online consultants will not be able to provide you with specific advice in regards to selection of specific breast implant size/profile. Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, computer imaging and direct examination/communication in front of a full-length mirror) will be critical.  Given that your surgery is coming up soon, the best way to alleviate your anxiety is to spend additional time with your plastic surgeon, preferably prior to the day of surgery.
Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "C or D cup”  or  etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup  size may also be inaccurate.  Again, the use of computer imaging, may be very helpful during the communication process.
3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers).  Viewing the patient's chest wall in the upright and supine positions, with temporary sizes in place, help select  the best breast implant size/profile for the specific patient.
I hope this, and the attached link (dedicated to breast augmentation surgery concerns), helps. Best wishes.

Implant volume does not always correlate to cup size. A baggy test might be helpful for you to perform to see if the volume you like approximates the cup size you desire.

I cannot guarantee cup sizes because I don't sell bras.  I sell breasts.  The cup size varies tremendously from person to person based on the size of the patient.  I agree with the assertion that a cup size is generally 150-225 cc, depending on the patient.  Therefore I expect you to be more in the full-C range if you are average sized.

I agree with Dr G. I always ask patients about the cup size they desire, but we cannot guarantee a particular size. Using sizers and choosing the right shape and profile implant is the key to choosing the right implant in my practice.  Do not focus on the cup size as this is not a precise science. Since you are posting this question, I would recommend that you go back and see your surgeon again prior to undertaking surgery.  Good luck.